Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 140
smometrlc scale to practically supplant the prismo-meter as an Instrument for verifying measurements. THE PERFECTED PRI3M0METER. lai The divisions of the graduated bar, numbered 2, 3, 4, up to 10, are placed^ i) i> h up to jijy of the meter* length, counted from the knife-edge,which represents… … Fig. 3. edge, marked 1 and 2, which, being equal to correlative centimeter deflec-tions at the meter-plane, correspond to their equivalents in prism-dioptrie6.To facilitate subdivision of these graduations the index-plate is providedwith a transverse slide bearing its allotted part of the…
Lenses
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